The Uptake of Colloidal Melanin from Seawater by Marine Bivalves

Tack, Jurgen; Polk, P.

doi:10.1111/j.1439-0485.1996.tb00526.x

Cited by 7 publications

(8 citation statements)

References 18 publications

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“…The uptake of the fluorescein-labeled colloidal carbohydrate dextrans provided direct experimental evidence for the colloid ingestion by the mussels. Tack and Polk (1995) used the colloidal melanin from the ink sac of the cuttlefish, Sepia sp., which was prefiltered through a Whatman glass-fiber filter with 1.2-m nominal pore size, to measure the uptake of colloidal DOC (0.2-1.2 m) by 13 species of bivalves. The gut contained the blackened compounds, suggesting that the colloidal ink particles were in fact ingested by the bivalves.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, the bivalves may potentially ingest components of the colloidal fraction of DOC (Tack and Polk 1995). Submicron colloidal organic carbon (COC, 1 kDa -0.22 m) is abundant in natural waters and acts as the intermediary between low molecular weight ultrafiltered organic carbon (UOC) and particulate organic carbon (POC) (Guo and Santschi 1997a;Pettine et al 2001).…”

mentioning

confidence: 99%

“…Earlier studies have demonstrated that dissolved free amino acids can serve as an important nutritional supplement for the marine bivalves Mytilus edulis and Modiolus modiolus, and the net accumulation by carrier-mediated transport occurred at a relatively low concentration (1 mol L Ϫ1 (Wright et al 1975;Wright and Manahan 1989). Moreover, the bivalves may potentially ingest components of the colloidal fraction of DOC (Tack and Polk 1995). Submicron colloidal organic carbon (COC, 1 kDa -0.22 m) is abundant in natural waters and acts as the intermediary between low molecular weight ultrafiltered organic carbon (UOC) and particulate organic carbon (POC) (Guo and Santschi 1997a; Pettine et al 2001).…”

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confidence: 99%

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Differential uptake of dissolved and particulate organic carbon by the marine musselPerna viridis

Pan

Wang

2004

Limnology & Oceanography

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We used radiotracers in laboratory experiments to determine the organic carbon uptake by the marine mussel Perna viridis from different diets (phytoplankton and detritus) and from the dissolved phase (colloidal and low molecular weight organic carbon). Standard compounds (glucose, arginine, and leucine, and the carbohydrate macromolecular dextran with sizes ranging from 3-2,000 kDa) were used to study organic matter flux into the green mussels. Carbon absorption was significantly affected by the food type and quality. The highest absorption efficiency (AE, 80%) was from the diatom Thalassiosira pseudonana, while the AE from Chlorella autotrophica was comparable with those from three types of algal detritus (20-30%). Mussels were able to directly ingest macromolecular dextran colloidal materials. Significant accumulation of these compounds was found both in the gills and the digestive glands of the mussels within the 12-17-h exposure period. Similarly, a significant accumulation of biogenic colloidal organic carbon (COC) and low molecular weight ultrafiltered organic carbon (UOC) was found. Uptake of UOC and COC resulting from the decomposition of different algal sources was comparable, with an uptake rate constant of 6.08 ϫ 10 Ϫ4 L g Ϫ1 dry wt h Ϫ1 and an absorption efficiency of 0.0053%. A kinetic model was subsequently applied to quantitatively evaluate the carbon contribution from dissolved and particulate sources to general organic carbon uptake by the mussels. Mussels accumulated organic carbon predominantly from the particulate phase, with very little (Ͻ0.2%) coming from the DOC. However, the apparent ingestion and accumulation of colloids suggest that they can actively participate in the food chain dynamics in marine systems.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Differential uptake of dissolved and particulate organic carbon by the marine musselPerna viridis

Pan

Wang

2004

Limnology & Oceanography

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“…They attributed this increase to the direct ingestion and digestion of colloidally complexed metals at higher DOC concentrations. The increase in Hg(II) uptake by the green mussels with increasing HA concentrations can be explained by the possible direct absorption of natural DOC (Tack & Polk 1996, Roditi et al 2000 or through the increasing interactions of metals with the charged surfaces of the animals (Campbell et al 1997). Similarly, the increasing influx of colloidal Hg(II) compared to the LMW-Hg may also be attributed to ingestion into the mussel digestive gland.…”

Section: Mercury Uptake Influenced By Colloidal Organic Carbonmentioning

confidence: 99%

Uptake of Hg(II) and methylmercury by the green mussel Perna viridis under different organic carbon conditions

Pan¹,

Wang²

2004

Mar. Ecol. Prog. Ser.

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The bioavailability and toxicity of mercury to aquatic organisms are greatly dependent on its chemical species, such as inorganic and methylated mercury. We examined the influences of various physico-chemical parameters [metal concentration, salinity, dissolved organic carbon (DOC) and colloidal organic carbon (COC) on the bioavailability of inorganic mercury (Hg(II)] and monomethylmercury (MeHg) to the green mussel Perna viridis. The uptake rate constant of MeHg was about 8.5x higher than that of Hg(II). The uptake increased by 75% for Hg(II) and 117% for MeHg with decreasing salinity from 30 psu to 15 psu. Biogenic DOC derived from diatom decomposition decreased the uptake of Hg(II), consistent with the results of DOC originating from natural seawater. In contrast, the uptake of Hg(II) was enhanced considerably in the presence of humic acid. The bioavailability of MeHg was only weakly influenced by differences in DOC quality or quantity, but it was significantly decreased by estuarine DOC. The influence of COC on Hg bioavailability was also dependent on the colloidal structural properties and the colloid-metal complexation. Binding with colloidal nanoparticles increased the uptake of Hg(II) by 3.3 to 7.3 times compared to low molecular weight-complexed Hg, but decreased the uptake of MeHg by 42 to 73%. For both Hg(II) and MeHg, the uptake of the 9 d aged radiolabeled metals was lower than the uptake of the 2 d aged radiolabeled forms. Our study suggests that various mechanisms, such as facilitated transport and direct colloidal ingestion, are involved in the uptake of Hg(II) and MeHg under different dissolved and colloidal organic carbon conditions. COC and DOC need to be separately considered, given their different influences on mercury uptake. KEY WORDS: Mercury · Methylmercury · Dissolved organic carbon · Colloidal organic carbon · InfluxResale or republication not permitted without written consent of the publisher

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“…Moreover, bivalves may potentially ingest components of the colloidal fraction of dissolved organic materials or carbon (DOC; Tack and Polk, 1995). The submicron colloidal organic carbon (COC, 1 kDa±0.22 "m) is abundant in natural water and acts as the intermediary between low-molecular-weight ultrafiltered organic carbon (UOC) and particulate organic carbon (POC).…”

Section: Uptake and Transfer Of Metalsmentioning

confidence: 99%

Metals and organic contaminants in bivalve molluscs

Wang

2009

Shellfish Safety and Quality

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The Uptake of Colloidal Melanin from Seawater by Marine Bivalves

Cited by 7 publications

References 18 publications

Differential uptake of dissolved and particulate organic carbon by the marine musselPerna viridis

Differential uptake of dissolved and particulate organic carbon by the marine musselPerna viridis

Uptake of Hg(II) and methylmercury by the green mussel Perna viridis under different organic carbon conditions

Metals and organic contaminants in bivalve molluscs

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